JP2000007360A - Production of glass element - Google Patents

Production of glass element

Info

Publication number
JP2000007360A
JP2000007360A JP17876398A JP17876398A JP2000007360A JP 2000007360 A JP2000007360 A JP 2000007360A JP 17876398 A JP17876398 A JP 17876398A JP 17876398 A JP17876398 A JP 17876398A JP 2000007360 A JP2000007360 A JP 2000007360A
Authority
JP
Japan
Prior art keywords
glass
molten glass
receiving
lump
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17876398A
Other languages
Japanese (ja)
Inventor
Isamu Shigyo
勇 執行
Masayuki Tomita
昌之 冨田
Hiroyuki Kubo
裕之 久保
Tamakazu Yogo
瑞和 余語
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP17876398A priority Critical patent/JP2000007360A/en
Publication of JP2000007360A publication Critical patent/JP2000007360A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/10—Forming beads
    • C03B19/1005—Forming solid beads
    • C03B19/104—Forming solid beads by rolling, e.g. using revolving cylinders, rotating discs, rolls
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
    • C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of defect caused by cutting, and stain, scratch or the like caused by the contact with a molding mold by separating a constant amount of a molten glass from a molten glass flow flowing out from a glass-flowing out pipe after receiving the glass in a receiving vessel, and transferring the separated molten glass lump to a molding mold to mold into a spherical shape. SOLUTION: A molten glass flow 111 is allowed to flow out from a glass flowing-out pipe 101, and a receiving mold unit 1 is lowered downward after a prescribed amount of the glass is received by a receiving mold 11 of a receiving mold unit 1. At the time, a constricted part is generated at the neighbor of the tip part of the molten glass flow 111, and the part under the constricted part is separated as a softened state molten glass lump by the self weight and the surface tension. The obtained molted glass lump is received by a receiving mold unit 1 and when the lump becomes the state having a prescribed viscosity, the receiving mold unit 1 is tilted to roll and transfer the lump on a molding mold 21 of a molding mold unit 2. At the time, an ultrasonic vibration is imparted to the molding mold unit 2 by an oscillator 31, and further a prescribed amount of N2 gas is allowed to flow from a gas-supplying pipe 23.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、例えば、カメラや
ビデオカメラに用いられるレンズなどのガラス素子（こ
れは、主として、高精度の光学機能面を有する最終成形
品を得る際のプレフォームとしての球形のガラス素材）
を、熱間加工で成形する際に用いられる、ガラス素子の
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass element such as a lens used for a camera or a video camera (this is mainly used as a preform for obtaining a final molded product having a high-precision optical function surface). Spherical glass material)
And a method for producing a glass element, which is used when hot-forming is performed.

【０００２】[0002]

【従来の技術】従来からプレフォームとしての精度の良
い球形のガラス素材は、ガラスブロックを近似の形状に
切断した後、これを研削、研磨の加工を経て、球形にす
るが、研削、研磨の工程があるためにコスト高となり、
同時に、切断、研削、研磨によるガラス屑が多量に発生
するという問題があった。2. Description of the Related Art Conventionally, a highly accurate spherical glass material as a preform is formed by cutting a glass block into an approximate shape, and then grinding and polishing the glass block into a spherical shape. The cost increases because of the process,
At the same time, there is a problem that a large amount of glass dust is generated by cutting, grinding, and polishing.

【０００３】また、高精度が要求されない球形のガラス
素材の製造方法として、溶融されたガラス素材を火炎
や、高速ガスにより吹き飛ばし、溶融ガラスの表面張力
を利用して球状のガラスを得る方法が知られているが、
カメラレンズなどのガラス素材となり得るような、精度
の良い、安定した形状のものではなかった。Further, as a method of manufacturing a spherical glass material which does not require high precision, there is known a method of blowing a molten glass material with a flame or a high-speed gas to obtain a spherical glass using the surface tension of the molten glass. Has been
It was not an accurate, stable shape that could be used as a glass material for camera lenses and the like.

【０００４】この点を考慮したものとして、例えば、特
開平２−１４８３９号公報に記載の発明では、表面にキ
ズや汚れの無い、球形のガラス素子を、直接、溶融ガラ
スから得る方法が提示された。この球形のガラス素子の
成形方法は、流出パイプから流下する溶融ガラスを自然
滴下させるか、あるいは、切断刃で切断することで、所
定量の溶融ガラス塊を得て、その溶融ガラス塊を、ラッ
パ状の成形面を有する成形型内に落下させ、その成形面
の底部から吹き上げる気体で、成形面から浮上させた状
態で、回転し、その過程で、全体を球形にするのであ
る。このため、ここでの成形型は、その成形面が鏡面に
仕上げられていて、底部に空気、不活性ガスなどの気体
を吹出すための細孔を有している。In consideration of this point, for example, in the invention described in Japanese Patent Application Laid-Open No. 2-14839, a method is proposed in which a spherical glass element free from scratches and stains on the surface is directly obtained from molten glass. Was. The method of forming this spherical glass element is to drop a molten glass flowing down from an outflow pipe naturally, or by cutting it with a cutting blade to obtain a predetermined amount of molten glass lump, and the molten glass lump is wrapped. It is dropped into a mold having a shape-like molding surface, and the gas blown from the bottom of the molding surface is rotated while floating above the molding surface, and in the process, the whole is made spherical. For this reason, the molding die here has a mirror-finished molding surface, and has pores at the bottom for blowing out gas such as air or inert gas.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、上述の
特開平２−１４８３９号公報の発明の成形方法では、溶
融ガラスを自然滴下させるか、あるいは、切断刃で切断
し、その得られた溶融ガラス塊を成形型のラッパ状の成
形面内に落下させ、球形のガラス素子とするために、以
下のような問題があった。However, in the molding method of the invention disclosed in Japanese Patent Application Laid-Open No. 2-14839, the molten glass is spontaneously dropped or cut with a cutting blade, and the obtained molten glass lump is obtained. In order to make the glass element fall into the trumpet-shaped molding surface of the molding die to form a spherical glass element, the following problems arise.

【０００６】（１）流出パイプから流下する溶融ガラス
を切断刃で切断する方法では、目視ではほとんど判別不
能な程度であっても、その部分に切断痕が残り、このガ
ラス塊を球形にして、そのまま、レンズなどの光学素子
のプレフォームとしてのガラス素子に使用するには、光
学的な悪影響が出易く、また、仮に、切断開始の当初に
は、切断痕の影響が全く出ないとしても、切断刃の汚れ
や劣化などにより、溶融ガラス塊に切断跡が残り易くな
り、連続した、長期にわたる成形では、その品質の安定
性を確保することが困難である。(1) In the method of cutting molten glass flowing down from an outflow pipe with a cutting blade, even if it is almost indistinguishable visually, a cutting mark remains at that portion, and this glass lump is formed into a spherical shape. As it is, when used for a glass element as a preform of an optical element such as a lens, an optical adverse effect is likely to occur, and even if there is no influence of a cutting mark at the beginning of cutting, Due to dirt or deterioration of the cutting blade, cutting marks easily remain on the molten glass lump, and it is difficult to secure the quality stability in continuous and long-term molding.

【０００７】（２）流出パイプから流下する溶融ガラス
を滴下する方法では、ガラスが粘性を有しているため、
滴下時にガラスが伸ばされ、その部分が細くなり、早期
に熱が奪われることで、糸状に固化し、これが、再度、
溶融ガラス塊内に溶け込み、脈理と呼ばれる、ガラス素
子として、光学的に不均質な欠陥を生じ易い。(2) In the method of dripping molten glass flowing down from an outflow pipe, since the glass has viscosity,
The glass is stretched at the time of dropping, the part becomes thinner, heat is taken away early, and it solidifies into a thread, and this again,
It melts into the molten glass mass and tends to cause optically inhomogeneous defects as glass elements called striae.

【０００８】（３）同じく、溶融ガラスを滴下する方法
において、滴下するガラスの重量が流出パイプの径とガ
ラスの表面張力とに依存するため、特に、滴下できるガ
ラスの重量が流出パイプの径により大きく左右されるた
め、任意の重量のガラス塊を得ようとする都度、流出パ
イプの径を変更しなければならない。これはガラス素子
の製造を中断し、流出パイプの交換などの面倒があっ
て、生産性の上で、好ましくない。(3) Similarly, in the method of dropping molten glass, the weight of the dropped glass depends on the diameter of the outflow pipe and the surface tension of the glass. Since it is greatly affected, the diameter of the outflow pipe must be changed every time an attempt is made to obtain a glass block having an arbitrary weight. This interrupts the production of the glass element and causes trouble such as replacement of the outflow pipe, which is not preferable in terms of productivity.

【０００９】（４）これらの切断や滴下の方法におい
て、軟らかい溶融ガラス塊を成形型内に落下させる際、
その溶融ガラスが、落下時に鏡面加工された型の成形面
と接触し、これを汚染したり、傷つけて、あるいは、高
温の溶融ガラスの接触によって成形面が酸化されること
で、型寿命を低下させ、更には、このように型自体が劣
化した状態で使用すると、それにより、溶融ガラス塊が
落下し、接触した時に、その溶融ガラス塊にキズ、汚れ
が発生し、成形されたガラス素子自体にも欠陥が残るこ
とになる。(4) In these cutting and dropping methods, when a soft molten glass lump is dropped into a mold,
When the molten glass contacts the molding surface of the mirror-finished mold at the time of falling, it contaminates or damages it, or the molding surface is oxidized by contact with the high-temperature molten glass, shortening the mold life Furthermore, if the mold itself is used in such a deteriorated state, the molten glass lump falls, and when the mold comes into contact with the glass lump, the molten glass lump is scratched or stained. Defects remain.

【００１０】本発明は、上記事情に基づいてなされたも
ので、その第１の目的とするところは、切断による欠陥
や溶融ガラスの落下などによる成形型との接触による汚
れやキズなどの欠陥の発生が全く無い、しかも、容易、
確実に所要精度の球形のガラス素子が得られる製造方法
を提供することにある。The present invention has been made based on the above circumstances, and a first object of the present invention is to eliminate defects such as dirt and scratches caused by contact with a molding die due to cutting or dropping of molten glass. There is no occurrence, and it is easy,
An object of the present invention is to provide a manufacturing method capable of reliably obtaining a spherical glass element having required accuracy.

【００１１】また、本発明の第２の目的とするところ
は、流出パイプのパイプ径を変更する必要がなく、所望
の重量（幅広い重量範囲）でのガラス素材を得ることが
でき、しかも、前述同様に欠陥が全く無い、所要精度の
球形のガラス素子を得られる製造方法を提供することに
ある。A second object of the present invention is to provide a glass material having a desired weight (a wide weight range) without changing the diameter of the outflow pipe. Another object of the present invention is to provide a manufacturing method capable of obtaining a spherical glass element having the required accuracy without any defect.

【００１２】更に、本発明の第３の目的とするところ
は、前述の欠陥の無い、高品質のガラス素材を、より真
球度の高い状態で得られる製造方法を提供することにあ
る。It is a third object of the present invention to provide a method for producing a high-quality glass material free of the above-mentioned defects and having a higher sphericity.

【００１３】[0013]

【課題を解決するための手段】上記目的を達成するた
め、本発明では、ガラス流出パイプより流出する溶融ガ
ラス流から一定量のガラスを受型に受けた後に分離し、
その分離した溶融ガラス塊を、前記受型から成形用の成
形型に移し、該成形型の上で球状に成形することを特徴
とする。In order to achieve the above object, according to the present invention, a certain amount of glass is separated from a molten glass stream flowing out of a glass outflow pipe after receiving the glass in a receiving mold.
The separated molten glass lump is transferred from the receiving mold to a molding die and molded into a spherical shape on the molding die.

【００１４】このような構成において、本発明では、更
に、溶融ガラス流から受型に受けたガラス、所定量で分
離された溶融ガラス塊、あるいは、球形への成形の状態
でのガラス素子と、これを浮上状態で支持する型との相
互の非接触を確実に維持するために、受型や成形型を多
孔質の材料で作り、その多孔質面からガスを噴出する構
造が採用される。In such a configuration, the present invention further provides a glass element in a receiving mold from a molten glass stream, a molten glass lump separated by a predetermined amount, or a glass element in a state of being formed into a spherical shape. In order to reliably maintain mutual non-contact with the mold that supports this in a floating state, a structure is adopted in which the receiving mold and the forming mold are made of a porous material and gas is ejected from the porous surface.

【００１５】また、本発明の実施の形態としては、流出
する溶融ガラス流を受型で受け、所定量のガラスが受型
上に溜まったところで、溶融ガラス流とガラスを分離し
て所定量の溶融ガラス塊を得る。これは、流出する溶融
ガラスが、勢いよく受型に当たるのを防ぐと共に、更
に、受型上でガラスを保持することで、溶融ガラス塊の
粘度を、次の球形への成形に適した粘度に調整すること
を、実質的に可能にするためである。According to an embodiment of the present invention, a molten glass flow flowing out is received by a receiving mold, and when a predetermined amount of glass is accumulated on the receiving mold, the molten glass flow and the glass are separated to form a predetermined amount of glass. Obtain a molten glass mass. This prevents the flowing molten glass from hitting the receiving mold vigorously, and furthermore, by holding the glass on the receiving mold, the viscosity of the molten glass block becomes a viscosity suitable for forming into the next spherical shape. This is to make the adjustment substantially possible.

【００１６】更に、この受型を多孔質材で作り、ガラス
を受ける受面から気体を噴出させることで、溶融ガラス
流からのガラスあるいは分離されたガラス塊と受型の受
け面とを、確実に非接触に保つことを可能とし、無欠陥
の溶融ガラス塊を、常時、連続して得ることができる。Further, the receiving mold is made of a porous material, and gas is blown out from the receiving surface for receiving the glass, so that the glass or the separated glass block from the molten glass flow and the receiving surface of the receiving mold can be reliably formed. , And a defect-free molten glass lump can always be obtained continuously.

【００１７】また、その後に、ある程度、粘度が増した
溶融ガラス塊を、成形型の成形面上に転がし、あるい
は、超音波振動などを与えられている成形型に移して、
その振動などで、溶融ガラス塊を回転しながら球形のガ
ラス素子に成形する。そして、そのまま、プレス成形に
供給し、あるいは、プレフォームとして固化する。この
時に、成形型も、前述の受型と同様に、多孔質材で作
り、成形面から気体を噴出させ、溶融ガラス塊と成形面
とを、常時非接触に保つことにより、溶融ガラス流から
ガラス素子成形までの間、ガラス表面を、完全に成形型
や受型と非接触にすることが可能となり、得られたガラ
ス素子が、完全に無欠陥の火作り面を備えることにな
る。After that, the molten glass lump having increased viscosity to some extent is rolled on the molding surface of the molding die or transferred to a molding die to which ultrasonic vibration or the like is given.
Due to the vibration or the like, the molten glass lump is formed into a spherical glass element while rotating. And, as it is, it is supplied to press molding or solidified as a preform. At this time, the molding die is also made of a porous material, similarly to the receiving mold described above, and a gas is blown out from the molding surface to keep the molten glass mass and the molding surface in a non-contact state at all times. Until the glass element is formed, the glass surface can be completely kept out of contact with the forming die and the receiving mold, and the obtained glass element has a completely defect-free fire surface.

【００１８】なお、本発明の実施の形態においては、溶
融ガラス流から受型上に受けたガラスを分離する際に、
受型を下降させて、ガラス流出ノズルより流出する溶融
ガラス流と受型上のガラスとの間にくびれを発生させ、
次いで、受型の下降速度を落とす（微速）か、または、
停止させて、ガラスの自重と表面張力とで、前記くびれ
を成長させることにより、くびれ部分から溶融ガラス流
とガラスとを分離し、所要重量の溶融ガラス塊を得てい
る。In the embodiment of the present invention, when separating the glass received on the receiving mold from the molten glass stream,
Lowering the receiving mold to generate a neck between the molten glass flow flowing out of the glass outflow nozzle and the glass on the receiving mold,
Next, reduce the descending speed of the receiving mold (very slow), or
The glass is stopped and the constriction is grown by its own weight and surface tension to separate the molten glass flow and the glass from the constricted portion, thereby obtaining a required mass of molten glass.

【００１９】従って、溶融ガラス流を受型で受け止める
ことで、従来のように、ガラス塊が落下して、型に当た
るような衝撃を回避することができる。また、受型上に
ガラスを溜める時間を任意に選択することで分離するガ
ラス塊の重量を任意に設定でき、更に、溶融ガラス流と
受型上のガラスとの間に、従来のような、急激な温度降
下でガラスが引延ばされて糸状に固化するような現象が
ないため、溶融ガラス流の先端、および、分離された溶
融ガラス塊のどちらにも、分離に伴う痕跡を残すことな
く、常に、安定した重量で、無欠陥の溶融ガラス塊が得
られる。Therefore, by receiving the molten glass flow by the receiving mold, it is possible to avoid the impact that the glass lump falls and hits the mold as in the related art. In addition, the weight of the glass block to be separated can be arbitrarily set by arbitrarily selecting the time for collecting the glass on the receiving mold, and further, between the molten glass flow and the glass on the receiving mold, as in the related art, There is no phenomenon that the glass is stretched by a rapid temperature drop and solidified into a thread, so there is no trace of separation at the tip of the molten glass flow or at the separated molten glass lump. A defect-free molten glass mass is always obtained with a stable weight.

【００２０】また、本発明の実施の形態において、受型
から成形型の凹形の成形面上に溶融ガラス塊を移す際
に、その成形面の中心から離れた個所に溶融ガラス塊を
置くことで、溶融ガラス塊に転がりを与え、あるいは／
および、成形型に往復動または回転動による振動、好ま
しくは、超音波振動を与えることにより、溶融ガラス塊
を回転させるることで、あるいは、成形型に多孔質材料
を使用して、その成形面から噴出するガスの流量を不均
一にすることにより、溶融ガラス塊に転がり運動を与
え、球形のガラス素子を成形することができる。Further, in the embodiment of the present invention, when transferring the molten glass lump from the receiving mold to the concave molding surface of the molding die, the molten glass lump is placed at a position away from the center of the molding surface. To give rolling to the molten glass mass, or /
And, by vibrating the mold by reciprocating or rotating motion, preferably by applying ultrasonic vibration, by rotating the molten glass block, or by using a porous material for the mold, the molding surface By making the flow rate of the gas ejected from the nozzle non-uniform, a rolling motion is given to the molten glass lump, and a spherical glass element can be formed.

【００２１】更に、受型の受面の形状を、成形される球
形のガラス素子の形状にほぼ一致することで、球形化の
ための成形時間をより短縮したり、真球度を高めること
ができるが、本発明は、このような機能に基づく作用効
果に特に限定されるものではない。また、受型より成形
型へのガラス塊の移載は、そのガラス塊の粘度が低すぎ
ると、受型上で転がりにくくなり、また、高すぎると、
成形し難くなるため、１０4-7 ｄＰａ・ｓ程度の粘度を
有する時に行うのがより望ましい。また、この移載は、
型とガラスとの接触が生じないように、例えば、非接触
状態で浮上するような、出来るだけ移載に際して、衝撃
を伴わないように行うのが望ましい。Further, by making the shape of the receiving surface of the receiving mold substantially coincide with the shape of the spherical glass element to be molded, it is possible to further shorten the molding time for spheroidizing and to increase the sphericity. Although possible, the present invention is not particularly limited to the functions and effects based on such functions. Also, the transfer of the glass lump from the receiving die to the molding die, if the viscosity of the glass lump is too low, it is difficult to roll on the receiving die, and if it is too high,
Since molding is difficult, it is more preferable to perform the molding when it has a viscosity of about 10 4-7 dPa · s. Also, this transfer,
In order to prevent contact between the mold and the glass, for example, it is desirable to carry out the transfer as much as possible without causing an impact, such as floating in a non-contact state.

【００２２】[0022]

【発明の実施の形態】（第１の実施の形態）以下、本発
明の第１の実施の形態を、図面を参照して具体的に説明
する。図１は、本発明で用いられる成形装置の概略図で
あり、ここでは、符号１が受型ユニット、２が成形型ユ
ニットであり、各ユニット１および２は、それぞれ、多
孔質の材料でできている受型１１および成形型２１と、
それらを保持する受型ホルダー１２および成形型ホルダ
ー２２とで構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic view of a molding apparatus used in the present invention. Here, reference numeral 1 denotes a receiving unit, 2 denotes a molding unit, and each of the units 1 and 2 is made of a porous material. Receiving mold 11 and forming mold 21,
It is composed of a receiving die holder 12 and a molding die holder 22 for holding them.

【００２３】なお、ホルダー１２、２２には、流体を受
型１１、成形型１２に対してバランスよく供給分配する
ための圧力室１２ａ、２２ａが設けられており、更に、
型加熱用ヒーターと測温手段と（何れも図示せず）が埋
め込まれていて、受型１１の受面および成形型１２の成
形面から噴出する流体の温度を測定し、その温度に基づ
いて温度調整することができるようになっている。The holders 12 and 22 are provided with pressure chambers 12a and 22a for supplying and distributing the fluid to the receiving mold 11 and the forming mold 12 in a well-balanced manner.
A heater for heating the mold and a temperature measuring means (neither is shown) are embedded therein. The temperature of the fluid ejected from the receiving surface of the receiving die 11 and the molding surface of the molding die 12 is measured, and based on the measured temperatures. The temperature can be adjusted.

【００２４】また、受型ユニット１には、駆動装置（図
示せず）がそれぞれ取り付けられており、受型ユニット
１が矢印Ａで示す上下方向に移動できるようになってお
り、更に、矢印Ｂで示すように、型を傾ける動作ができ
るようになっている。ホルダー２２には、超音波振動発
生器３１が接続されており、ユニット２に超音波による
細かな振動を与えられるようになっている。A drive unit (not shown) is attached to the receiving unit 1 so that the receiving unit 1 can move in the vertical direction indicated by an arrow A. As shown by, the operation of tilting the mold can be performed. An ultrasonic vibration generator 31 is connected to the holder 22 so that the unit 2 can be subjected to fine vibrations by ultrasonic waves.

【００２５】また、ホルダー１２、２２には、図示のよ
うに、Ｎ2 ガス供給用の接続パイプ１３、２３が接続さ
れており、流量圧力調整器（図示せず）により、任意の
圧力及び流量に制御されたＮ2 ガスをホルダー１２、２
２に供給できるように成っていて、受型１１、成形型２
１より噴出するＮ2 ガスの温度、圧力、流量を任意に制
御できる構成となっている。As shown, connection pipes 13 and 23 for supplying N 2 gas are connected to the holders 12 and 22, respectively, and are provided with arbitrary pressure and flow rate by a flow rate pressure regulator (not shown). N 2 gas controlled to
2, the receiving die 11 and the forming die 2
The temperature, pressure and flow rate of the N 2 gas ejected from the nozzle 1 can be arbitrarily controlled.

【００２６】更に、符号１０１は、溶融軟化状態の溶融
ガラス流１１１の流出のための白金合金製のガラス流出
パイプであり、そして、この先端のノズル口１０２に
は、通電端子１０３ａ、１０３ｂ、および、ガラス流出
パイプ１０１に取り付けられた通電端子１０４ａ、１０
４ｂが、電力調整供給機（図示せず）に接続されてお
り、ノズル口１０２およびガラス流出パイプ１０１を、
それぞれ、独立に加熱温調することができるようになっ
ている。Further, reference numeral 101 denotes a platinum alloy glass outflow pipe for outflow of a molten glass flow 111 in a melt-softened state, and a current-carrying terminals 103a, 103b, and Current-carrying terminals 104a, 10a attached to the glass outflow pipe 101.
4b is connected to a power adjusting and supplying machine (not shown), and connects the nozzle port 102 and the glass outflow pipe 101 to each other.
The heating temperature can be controlled independently of each other.

【００２７】図２ないし図４は、溶融軟化状態の溶融ガ
ラス流を流出パイプのノズル口より受型上に供給し、更
に、供給されたガラスを溶融ガラス流から分離するとき
の工程説明図である。図２における符号１１２ａは、受
型１１の上に供給されて、溜められた分離前のガラス
を、また、図３における符号１１３は、分離のために溶
融ガラス流１１１と分離前のガラス１１２ａとの間に作
られるくびれを、更に、図４における符号１１２は、分
離後において受型１１上に得られた溶融ガラス塊を表わ
す。FIG. 2 to FIG. 4 are process explanatory diagrams when a molten glass flow in a molten and softened state is supplied from a nozzle port of an outflow pipe onto a receiving mold, and further, the supplied glass is separated from the molten glass flow. is there. Reference numeral 112a in FIG. 2 denotes the glass before separation supplied and accumulated on the receiving mold 11, and reference numeral 113 in FIG. 3 denotes the molten glass flow 111 and the glass 112a before separation for separation. The symbol 112 in FIG. 4 represents the molten glass mass obtained on the receiving mold 11 after separation.

【００２８】なお、ここで成形されるガラス材料には、
その粘度が温度：１２００℃の時に１０1.6 ｄＰａ・
ｓ、温度８９０℃の時に１０2.9 ｄＰａ・ｓ、温度：７
２０℃の時に１０5 ｄＰａ・ｓ、温度：６１０℃の時に
１０7.55ｄＰａ・ｓ、更に、温度：４９８℃の時に１０
13ｄＰａ・ｓとなるような、粘性特性を持つ光学ガラス
を用いた。The glass material formed here includes:
When the viscosity is 1200 ° C., 10 1.6 dPa ·
s, 10 2.9 dPa · s at a temperature of 890 ° C., temperature: 7
10 5 dPa · s at 20 ° C., 10 7.55 dPa · s at 610 ° C., and 10 10 dPa · s at 498 ° C.
Optical glass having a viscosity characteristic of 13 dPa · s was used.

【００２９】また、ガラス流出パイプ１０１およびノズ
ル口１０２は、内径：２ｍｍ、外径：３ｍｍのものを使
用し、通電端子１０３ａ、１０３ｂと、通電端子１０４
ａ、１０４ｂとに、それぞれ通電した状態で、溶融ガラ
ス流１１１を流出させた。この時のガラスの流量は、
２．４〜９．０グラム／分の範囲で有る。もしも、これ
よりも流量を落とすため、ガラス流出パイプ１０１、ノ
ズル口１０２の温度を下げる場合には、後に述べるよう
に、溶融ガラス流とガラスとの分離がうまくゆかず、分
離後の溶融ガラス塊に糸状のガラスが残ってしまい、ま
た、逆に、流量を上げるため、ガラス流出パイプ１０
１、ノズル口１０２の温度を上げる場合、溶融ガラス流
１１１の表面からのガラス成分の部分的な揮発が多くな
り、分離された溶融ガラス塊１１２の表面に、前記揮発
による屈折率の違う部分が脈理として残り、予期するよ
うな十分な光学的性能を満足できなくなる。The glass outflow pipe 101 and the nozzle port 102 have an inner diameter of 2 mm and an outer diameter of 3 mm.
The molten glass stream 111 was flowed out to each of the a and 104b in a state where power was supplied. The flow rate of glass at this time is
The range is from 2.4 to 9.0 grams / minute. If the temperature of the glass outflow pipe 101 and the nozzle port 102 is reduced to reduce the flow rate more than this, as described later, separation of the molten glass flow and the glass does not work well, and the molten glass Thread-like glass remains on the glass, and conversely, the glass outflow pipe 10
1. When the temperature of the nozzle port 102 is increased, the partial volatilization of the glass component from the surface of the molten glass stream 111 increases, and a portion having a different refractive index due to the volatilization is formed on the surface of the separated molten glass block 112. It remains as a striae, and it cannot satisfy satisfactory optical performance as expected.

【００３０】次に、上記の成形装置を使用して、ガラス
製品を成形する工程を、図を用いて具体的に説明する。
ここではノズル口１０２からの流出量を、このガラス流
出パイプ１０１、ノズル口１０２で、流出及び分離可能
な最低限の流量である２．４グラム／分となるように、
これらの温度を制御し、ガラス流からガラスを分離し
て、所要量の溶融ガラス塊１１２を得るまでの成形タク
トを５秒に設定した。Next, the step of forming a glass product using the above-described forming apparatus will be specifically described with reference to the drawings.
Here, the outflow amount from the nozzle port 102 is set to 2.4 g / min, which is the minimum flow rate that can be outflowed and separated by the glass outflow pipe 101 and the nozzle port 102.
These temperatures were controlled to set the molding tact to 5 seconds to separate the glass from the glass stream and obtain the required amount of molten glass lump 112.

【００３１】なお、受型１１の凹形の受面は、上記設定
で得られる０．２グラムで、直径が５．０１ｍｍの球を
想定して、半径が２．５ｍｍの半球となるように加工し
た。また、その受型１１の材料として、気孔率が３０％
であり、最大穴径が８ミクロンである多孔質のカーボン
を用い、受け面からの噴出ガスには、受型１１の酸化を
防ぐために、窒素ガスを用いた。また、上述同様に、成
形型２１には、受型１１と同じ材質で、その成形面の曲
率半径が２０ｍｍの凹球面に加工したものを準備した。Note that the concave receiving surface of the receiving die 11 is a hemisphere having a radius of 2.5 mm, assuming a sphere having a diameter of 5.01 mm and 0.2 g obtained by the above setting. processed. The material of the receiving mold 11 has a porosity of 30%.
Porous carbon having a maximum hole diameter of 8 μm was used, and nitrogen gas was used as a gas ejected from the receiving surface in order to prevent oxidation of the receiving die 11. In the same manner as described above, the molding die 21 was prepared using the same material as the receiving die 11 and processed into a concave spherical surface having a molding surface with a radius of curvature of 20 mm.

【００３２】そして、このように加工、準備した受型１
１、成形型２１を、図１に示す成形装置に取り付け、図
２ないし図４に示すような方法で、溶融ガラス塊を得
た。ここで、この行程をより具体的に説明する。まず、
ガラス溶融炉（図示せず）で所要のガラス素材を溶融
し、脱泡、均質化工程を経て、軟化状態の均質な溶融ガ
ラスを準備する。更に、それをガラス流出パイプ１０１
へ導く。ここでは、パイプ１０１、ノズル口１０２を、
前述のように、２．４グラム／分の流出量となるように
設定し、溶融ガラス流１１１を流出させると共に、受型
ユニット１をパイプ１０１の直下に持って行く。そし
て、図２に示すように、受型１１上に所定の容量のガラ
スを受けた後、図３に示すように、受型ユニット１を下
方へ距離：Ｌだけ下げて、溶融ガラス流１１１とガラス
１１２ａの間にクビレ１１３を発生させ、ガラス１１２
ａが自重と表面張力により分離するまで、同じ位置で待
機させ、図４に示すように、軟化状態の溶融ガラス塊１
１２を得た。The receiving mold 1 thus processed and prepared is
1. The molding die 21 was attached to the molding apparatus shown in FIG. 1, and a molten glass lump was obtained by the method shown in FIGS. Here, this process will be described more specifically. First,
A required glass material is melted in a glass melting furnace (not shown), defoamed, and homogenized to prepare a homogeneous molten glass in a softened state. Furthermore, it is connected to the glass outflow pipe 101
Lead to. Here, the pipe 101 and the nozzle port 102 are
As described above, the flow rate is set so as to be 2.4 g / min, the molten glass flow 111 is discharged, and the receiving unit 1 is brought directly below the pipe 101. Then, as shown in FIG. 2, after receiving a predetermined volume of glass on the receiving die 11, the receiving unit 1 is lowered downward by a distance L as shown in FIG. A crack 113 is generated between the glass 112a and the glass 112
a at the same position until a is separated by its own weight and surface tension, and as shown in FIG.
12 was obtained.

【００３３】このように溶融ガラス流１１１の分離工程
において、受型ユニット１を一旦停止させることによ
り、クビレ１１３の部分が、従来のように糸状に引き延
ばされて急激に冷やされ、固化することがなく、ガラス
１１２ａを自重と表面張力により自然に分離することが
可能となる。しかも、従来のように切断刃を用いた分離
と異なり、切断痕が残らないため、分離された溶融ガラ
ス塊１１２の表面には有害な欠陥が生じることがない。As described above, in the separation step of the molten glass flow 111, the mold receiving unit 1 is temporarily stopped, so that the rib 113 is stretched like a thread as in the related art, rapidly cooled, and solidified. Therefore, the glass 112a can be naturally separated by its own weight and surface tension. In addition, unlike the conventional separation using a cutting blade, no cut marks remain, so that no harmful defects occur on the surface of the separated molten glass block 112.

【００３４】また、この時、受面から噴出するＮ2 ガス
の温度は、溶融ガラス流１１１を受型１１に受ける時、
２００℃に調整し、更に、Ｎ2 ガスの流量も、溶融ガラ
ス流１１１を受型１１に受ける直前まで毎分：５リッタ
ー、その後、毎分：１リッターとなるように制御した。
これにより、溶融ガラス流１１１が受型１１に達する前
に、溶融ガラス流１１１の先端が多少固化し、流動性が
少なくなり、しかも、噴出するＮ2 ガスの流量も多いた
めに、溶融ガラス流１１１の先端が、全く受型１１の受
面に接触することなく、また、前述の分離方法を用いる
ことと併せて、表面に全く欠陥がない溶融ガラス塊１１
２が得られた。At this time, the temperature of the N 2 gas ejected from the receiving surface is determined by
The temperature was adjusted to 200 ° C., and the flow rate of the N 2 gas was also controlled so as to be 5 liters per minute until immediately before the molten glass flow 111 was received by the receiving mold 11, and then to 1 liter per minute.
As a result, before the molten glass flow 111 reaches the receiving mold 11, the tip of the molten glass flow 111 is slightly solidified, the fluidity is reduced, and the flow rate of the jetted N 2 gas is large. The tip of 111 has no contact with the receiving surface of the receiving mold 11, and in addition to using the above-described separation method, the molten glass lump 11 having no surface defect at all.
2 was obtained.

【００３５】次に、溶融ガラス塊１１２の粘度が１０4
ｄＰａ・ｓとなったところで、図１に示すように、受型
ユニット１を傾け、成形型ユニット２の成形型２１の成
形面の外周近くに溶融ガラス塊１１２を転がして、移載
した。この際、成形型ユニット２には、発振機３１より
超音波振動を与えておき、更に、ガス供給管２３を介し
て、Ｎ2 ガスを毎分：２０リッターで流して置いた。こ
のように、前の工程で受型１１の受け面を、予め、成形
すべきガラス素子に近似の球形にして置き、更に、得よ
うとするガラス素子の容量が比較的小さい場合、溶融ガ
ラス塊１１２がほぼ球形であったこと、成形型２１の成
形面の外周部にそれを転がして移載したこと、および、
成形型ユニット２に超音波振動を与え、Ｎ2 ガスを供給
して成形面から噴出させたことで、溶融ガラス塊１１２
は、成形型２１に全く接触することなく、転がり回転し
ながら、ほぼ真球の形状になり、その間に固化した。Next, the viscosity of the molten glass block 112 becomes 10 4
When dPa · s was reached, as shown in FIG. 1, the receiving unit 1 was tilted, and the molten glass block 112 was rolled and transferred near the outer periphery of the forming surface of the forming die 21 of the forming unit 2. At this time, ultrasonic vibration was applied to the molding unit 2 from the oscillator 31, and N 2 gas was flowed through the gas supply pipe 23 at a flow rate of 20 liters per minute. In this way, in the previous step, the receiving surface of the receiving die 11 is previously set in a spherical shape approximate to the glass element to be molded, and when the capacity of the glass element to be obtained is relatively small, the molten glass 112 was substantially spherical, and it was rolled and transferred to the outer periphery of the molding surface of the molding die 21; and
By applying ultrasonic vibration to the mold unit 2 and supplying N 2 gas to eject the molten glass mass 112 from the molding surface.
While rolling and rotating without contacting the molding die 21 at all, it became substantially spherical, and solidified during that time.

【００３６】この成形作業を連続して行った結果、でき
上がったガラス素子が、０．２±０．００２グラムの重
量範囲で、真球度も５．０１±０．０５ｍｍ以内の収ま
っており、かつ、その表面には全く欠陥の無く、非常に
安定した良好な成形であったことが確認された。As a result of continuously performing this molding operation, the finished glass element fits within a weight range of 0.2 ± 0.002 g and a sphericity within 5.01 ± 0.05 mm. Moreover, it was confirmed that there was no defect on the surface and the molding was very stable and excellent.

【００３７】（第２の実施の形態）次に、図５に示す成
形型を用いて、第１の実施の形態と同じ装置と材料を用
いて、目標重量：０．５グラム、直径が６．８０ｍｍと
なるような、球形のガラス素子の成形を行った。なお、
この実施の形態において、成形型ユニット２ａには図１
の成形型ユニット２と同様に、ヒータ、熱電対（何れも
図示せず）が組み込まれており、更に、成形型ユニット
２と同様に、発振機３１が接続され、細かな振動が得ら
れるようになっている。また、図中、符号２２ｂ、２２
ｃは圧力室であり、更に、これら圧力室２２ｂ、２２ｃ
にはＮ2 ガス供給のための接続パイプ２３ｂ、２３ｃが
接続されており、また、流量圧力調整器（図示せず）に
より、Ｎ2 ガスを任意の圧力及び流量に制御して、これ
を圧力室２２ｂ、２２ｃに個々に供給できるようになっ
ている。また、成形型２１ａの成形面は、その曲率半径
が３０ｍｍの凹状の球面に加工されており、更に、成形
面上に噴出ガスの所要の分布が付けられるようになって
いる。(Second Embodiment) Next, using a mold shown in FIG. 5, using the same apparatus and material as in the first embodiment, a target weight: 0.5 g and a diameter of 6 A spherical glass element was formed so as to have a thickness of .80 mm. In addition,
In this embodiment, the mold unit 2a has the configuration shown in FIG.
A heater and a thermocouple (both not shown) are incorporated in the same manner as in the molding unit 2, and an oscillator 31 is connected in the same manner as in the molding unit 2 so that fine vibrations can be obtained. It has become. Further, in the figure, reference numerals 22b, 22
c is a pressure chamber, and furthermore, these pressure chambers 22b, 22c
Are connected to connection pipes 23b and 23c for supplying N 2 gas, and N 2 gas is controlled to an arbitrary pressure and flow rate by a flow rate pressure regulator (not shown), and the pressure is adjusted to a desired value. The chambers 22b and 22c can be individually supplied. The molding surface of the molding die 21a is processed into a concave spherical surface having a radius of curvature of 30 mm, and a required distribution of the jet gas is provided on the molding surface.

【００３８】また、受型１１は、第１の実施の形態と同
様に、溶融ガラス塊が成形型２１ａ上で転がり易くする
ために、最終的なガラス素子の形状より若干大きめの曲
率半径：３．５ｍｍの半球形に加工してある。また、型
材および噴出ガスも、第１の実施の形態と同様とした。Further, similarly to the first embodiment, the receiving die 11 has a radius of curvature: 3 slightly larger than the final shape of the glass element in order to make the molten glass lump easily roll on the forming die 21a. It is processed into a 0.5 mm hemisphere. In addition, the mold material and the jet gas were the same as in the first embodiment.

【００３９】このように加工、準備した受型１１、成形
型２１ａを、図１に示す成形装置に取り付けて、流出パ
イプ１０１より流出する溶融ガラスの流量が６グラム／
分となるように、流出パイプ１０１、ノズル口１０２の
温度を設定し、更に、受型の上で溶融ガラス塊を成形す
る間隔である成形タクトを約５秒に設定し、第１の実施
の形態と全く同様の工程を経て、溶融ガラス塊１１２を
得た。なお、この時、溶融ガラス塊の重量が一定となる
ように、随時、流出パイプ１０１およびノズル口１０２
の温度と、溶融ガラスを受型１１上で受けて、溜めてい
る時間とを微調整しながら、溶融ガラス塊を作製した。The receiving mold 11 and the forming mold 21a thus processed and prepared are attached to the forming apparatus shown in FIG. 1, and the flow rate of the molten glass flowing out of the outflow pipe 101 is 6 g / g.
The temperature of the outflow pipe 101 and the nozzle port 102 is set so as to obtain the same length, and the forming tact, which is the interval for forming the molten glass lump on the receiving mold, is set to about 5 seconds. Through exactly the same steps as in the embodiment, a molten glass lump 112 was obtained. At this time, the outflow pipe 101 and the nozzle port 102 are occasionally set so that the weight of the molten glass block becomes constant.
The molten glass lump was produced while finely adjusting the temperature and the time during which the molten glass was received on the receiving mold 11 and stored.

【００４０】次に、溶融ガラス塊１１２がガラス粘度で
１０4.5 ｄＰａ・ｓとなった時に、受型ユニット１を、
第１の実施の形態と同様に傾けて、溶融ガラス塊１１２
を、室温のＮ2 ガスを噴出させている成形型２１ａの成
形面上に置いた。そして、供給パイプ２３ｂ、２３ｃに
供給するＮ2 ガスの流量を、交互に増減させ、成形型２
１ａの成形面上の溶融ガラス塊１１２が、流量の多い面
から少ない面へ移動する動作を利用して、約１５秒間、
転がしながら冷却し、球形のガラス素子を成形した。こ
の時のガラス素子の温度は約３５０℃であった。Next, when the molten glass block 112 becomes 10 4.5 dPa · s at the glass viscosity, the receiving mold unit 1,
In the same manner as in the first embodiment, the molten glass
Was placed on the molding surface of the molding die 21a from which N 2 gas at room temperature was jetted. Then, the flow rate of the N 2 gas supplied to the supply pipes 23b and 23c is alternately increased and decreased, and
For about 15 seconds, the molten glass block 112 on the molding surface of 1a moves from the surface with the higher flow rate to the surface with the lower flow rate for about 15 seconds.
The glass element was cooled while being rolled to form a spherical glass element. At this time, the temperature of the glass element was about 350 ° C.

【００４１】その後、ガラス素子を取出し、第１の実施
の形態の場合と同様に、その精度を測定したが、重量精
度、真球度ともに、全て±０．５％以内のバラツキの範
囲に収まり、第１の実施の形態における成果と同様の、
良好な成果を得ることができた。Thereafter, the glass element was taken out and its accuracy was measured in the same manner as in the first embodiment, but both the weight accuracy and the sphericity were within the range of ± 0.5%. , Similar to the results in the first embodiment,
Good results were obtained.

【００４２】（第３の実施の形態）次に、目標重量：
０．９グラム、直径：８．２７ｍｍのガラス素子を、第
１の実施の形態で用いたのと同じ材料を用いて成形し
た。ここで用いた受型および成形型は、図６および図７
に示すようなもので、ここで、符号２０１は受型ユニッ
ト、２０２は成形型ユニットであり、受型ユニット２０
１は、第１の実施の形態で使用したものと違っており、
溶融ガラスを受けた後、図に示すように、型ユニットが
左右に分離し、溶融ガラス塊１１２を、下方に位置する
成形型２２１の成形面の上に静かに載置できるようにな
っている。(Third Embodiment) Next, target weight:
A glass element having a diameter of 0.9 g and a diameter of 8.27 mm was formed using the same material as that used in the first embodiment. The receiving mold and the mold used here are shown in FIGS.
Here, reference numeral 201 denotes a receiving unit, 202 denotes a molding unit, and the receiving unit 20
1 is different from the one used in the first embodiment,
After receiving the molten glass, the mold unit is separated into right and left as shown in the figure, so that the molten glass lump 112 can be gently placed on the molding surface of the molding die 221 located below. .

【００４３】なお、受型ユニット２０１は、多孔質材料
にてできている左右分割可能な受型２１１ａ、２１１ｂ
と、それらを保持する受型ホルダー２１２ａ、２１２ｂ
とで構成されている。また、これら受型ホルダー２１２
ａ、２１２ｂには、噴出ガスを受型２２１ａ、２２１ｂ
にバランスよく供給分配するための圧力室２１１ａ、２
１１ｂが設けられており、更に、型加熱用ヒーターと測
温手段（何れも図示せず）とが埋め込まれ、圧力室２１
１ａ、２１１ｂから成形面上に噴出する噴射ガスの温度
を調整することができるようになっている。また、受型
ユニット２０１には駆動装置（図示せず）が、それぞれ
取り付けられており、矢印Ｃで示す上下方向に移動で
き、更に、矢印Ｄで示すように、左右に分離可能になっ
ている。The receiving unit 201 is made of a porous material and can be divided into left and right parts.
And receiving mold holders 212a, 212b for holding them.
It is composed of In addition, these receiving mold holders 212
a and 212b are provided with receiving gas 221a and 221b.
Pressure chambers 211a, 2
11b, and a mold heating heater and a temperature measuring means (both not shown) are embedded therein.
The temperature of the injection gas ejected from 1a and 211b onto the molding surface can be adjusted. Further, a driving device (not shown) is attached to the receiving unit 201, and can be moved in a vertical direction indicated by an arrow C, and can be separated left and right as indicated by an arrow D. .

【００４４】また、成形型ユニット２０２は、第１の実
施の形態と同様の構成となっており、多孔質材料ででき
ている成形型２２１と、それを保持する成形型ホルダー
２２２とで構成されている。また、成形型ホルダー２２
２には、接続パイプ２２３を介して供給された噴出ガス
を、成形型２２１の成形面にバランスよく供給・分配す
るための圧力室２２２ａが設けられており、そこには、
型加熱用ヒーターと測温手段（何れも図示せず）が埋め
込まれていて、成形型２２１の成形面から噴出するガス
の温度も調整することができるようになっている。The mold unit 202 has the same structure as that of the first embodiment, and includes a mold 221 made of a porous material and a mold holder 222 for holding the mold. ing. Also, the mold holder 22
2 is provided with a pressure chamber 222a for supplying and distributing the jet gas supplied via the connection pipe 223 to the molding surface of the molding die 221 in a well-balanced manner.
A mold heater and a temperature measuring means (neither is shown) are embedded therein, so that the temperature of the gas ejected from the molding surface of the molding die 221 can be adjusted.

【００４５】成形型ホルダー２２２には、第１の実施の
形態と同様の、超音波振動の発生器（図示せず）が接続
されており、成形型ユニット２０２に、超音波による細
かな振動を与えられるようになっている。更に、成形型
ユニット２０２には駆動装置（図示せず）が取付けられ
ており、図７の矢印Ｅ、Ｆのように、紙面に対して左右
方向に振幅を与えたり、左右前後方向に回転・揺動させ
ることができるようになっている。An ultrasonic vibration generator (not shown) similar to that of the first embodiment is connected to the molding die holder 222, and a fine vibration by ultrasonic waves is applied to the molding die unit 202. Is to be given. Further, a driving device (not shown) is attached to the molding die unit 202, as shown by arrows E and F in FIG. It can be swung.

【００４６】また、受型ホルダー２１２ａ、２１２ｂお
よび成形型ホルダー２２２には、図示のように、Ｎ2 ガ
ス供給用の接続パイプ２１３ａ、２１３ｂおよび接続パ
イプ２２３が接続されており、これらへの噴出ガスの圧
力および流量を、流量圧力調整器（図示せず）により、
任意に制御する。この制御されたＮ2 ガスを、受型ホル
ダー２１２ａ、２１２ｂおよび成形型ホルダー２２２に
供給できるようになっていて、受型ホルダー２１１ａ、
２１１ｂおよび成形型ホルダー２２１の各圧力室２１４
ａ、２１４ｂおよび２２２ａより噴出するＮ2 ガスの温
度、圧力、流量を任意に制御できる構成となっている。As shown, connection pipes 213a, 213b and connection pipe 223 for supplying N 2 gas are connected to the receiving mold holders 212a, 212b and the forming mold holder 222, and the gas ejected therefrom is connected. The pressure and the flow rate are controlled by a flow pressure regulator (not shown).
Control arbitrarily. This controlled N 2 gas can be supplied to the receiving mold holders 212a and 212b and the forming mold holder 222, and the receiving mold holder 211a,
211b and each pressure chamber 214 of the mold holder 221
The temperature, pressure, and flow rate of the N 2 gas ejected from a, 214b, and 222a can be arbitrarily controlled.

【００４７】次に、上述の成形装置を使用して、前記の
ガラス素子を成形する工程を、具体的に説明する。ここ
では、ノズル口１０２からの流出量を、９グラム／分と
なるように流出パイプ１０１、ノズル口１０２の温度を
制御し、溶融ガラス流からガラスを分離し、溶融ガラス
塊を得るまでの成形タクトを約６秒に設定している。実
際の成形においては、流出パイプ１０１、ノズル口１０
２の温度とタクトを、溶融ガラス塊（当然、ガラス素
子）が所望の重量となるように、微調整しながら連続成
形を行った。Next, the step of forming the glass element using the above-described forming apparatus will be specifically described. Here, the temperature of the outflow pipe 101 and the nozzle port 102 is controlled so that the amount of outflow from the nozzle port 102 becomes 9 g / min, and the glass is separated from the molten glass flow to form a molten glass block. Tact is set to about 6 seconds. In actual molding, the outflow pipe 101, the nozzle port 10
Continuous molding was performed while finely adjusting the temperature and tact of No. 2 so that the molten glass lump (of course, the glass element) had a desired weight.

【００４８】なお、受型２１１ａと２１１ｂとの組み合
わせで形成される凹形状の受面は、半径：５．５ｍｍの
半球となるように加工した。また、材料として気孔率が
３０％であり、最大穴径が８ミクロンである多孔質のカ
ーボンを用い、噴出ガスには受型２１１の酸化を防ぐた
めに窒素ガスを用いた。同様に、成形型２２１は、前述
の受型２１１ａ、２１１ｂと同じ材質で、曲率半径：４
０ｍｍの凹球面形状に加工したものを準備した。The concave receiving surface formed by the combination of the receiving dies 211a and 211b was processed so as to be a hemisphere having a radius of 5.5 mm. Porous carbon having a porosity of 30% and a maximum hole diameter of 8 μm was used as a material, and nitrogen gas was used as a jet gas to prevent oxidation of the receiving mold 211. Similarly, the molding die 221 is made of the same material as the receiving dies 211a and 211b, and has a radius of curvature: 4
One processed into a concave spherical shape of 0 mm was prepared.

【００４９】次いで、このように加工・準備した受型２
１１ａ、２１１ｂ、成形型２２１を成形装置に取り付け
て、第１の実施例と同様に、図２ないし図４に示すよう
な方法で溶融ガラス塊を得た。ここで、ノズル口１０２
より溶融ガラス流１１１を流出させ、受型ユニット２０
１を流出パイプ１０１の直下に持って行き、図２に示し
た場合のように、受型２１１ａ、２１１ｂ上に所定の容
量のガラスを受けた。この時、流出につれて、受型２１
１ａ、２１１ｂ上のガラスとノズル口１０２とが接近し
すぎないように、また、溶融ガラス流１１１とガラスと
の間に急激な糸状のくびれが生じないように、徐々に受
型ユニット２０１を下げながらガラスを受けた。Next, the receiving mold 2 thus processed and prepared is
11a, 211b, and a mold 221 were attached to a molding apparatus, and a molten glass lump was obtained by the method shown in FIGS. 2 to 4 in the same manner as in the first embodiment. Here, the nozzle port 102
The molten glass flow 111 is caused to flow out, and the receiving unit 20
2 was taken directly below the outflow pipe 101, and a predetermined volume of glass was received on the receiving dies 211a and 211b as shown in FIG. At this time, the receiving mold 21
The receiving unit 201 is gradually lowered so that the glass on the nozzles 1a and 211b and the nozzle port 102 are not too close to each other, and so that a sharp thread-like constriction does not occur between the molten glass flow 111 and the glass. While receiving the glass.

【００５０】そして、ガラスが所定の重量に達した後、
図３に示す場合のように、受型ユニット２０１を若干下
げ、クビレ１１３を生じさせ、それが成長して分離に到
るまで、受型ユニット２０１を溶融ガラス流１１１の流
下速度以下の下降速度で、保持して、図４に示す場合の
ような状態にして、溶融ガラス塊１１２を得た。Then, after the glass reaches a predetermined weight,
As shown in FIG. 3, the receiving unit 201 is slightly lowered to form a crack 113, and the receiving unit 201 is moved down at a speed equal to or lower than the falling speed of the molten glass flow 111 until it grows and separates. Then, the molten glass lump 112 was obtained by holding and setting the state as shown in FIG.

【００５１】この時、噴出Ｎ2 ガスの温度は、溶融ガラ
ス流を受型２１１ａ、２１１ｂに受ける時で２００℃に
調整し、更に、Ｎ2 ガスの流量も、溶融ガラス流１１１
を受型２１１ａ、２１１ｂに受ける直前までは、毎分：
２０リッター、その後は、毎分：２リッターとなるよう
に制御した。これにより、溶融ガラス流１１１が受型２
１１ａ、２１１ｂに達する前に、溶融ガラス流１１１の
先端が多少固化し、流動性が少なくなり、噴出するＮ2
ガスの流量も多いために、溶融ガラス流１１１の先端が
全く受型２１１ａ、２１１ｂに接触することなく、ま
た、前記の分離方法を用いることとも併せて、表面には
全く欠陥がない溶融ガラス塊１１２が得られた。At this time, the temperature of the jetted N 2 gas is adjusted to 200 ° C. when the molten glass flow is received by the receiving dies 211 a and 211 b, and the flow rate of the N 2 gas is also adjusted to the molten glass flow 111.
Every minute until immediately before receiving in the receiving molds 211a and 211b:
It was controlled to be 20 liters and thereafter to 2 liters per minute. As a result, the molten glass flow 111 is
Before reaching 11a and 211b, the tip of the molten glass stream 111 is slightly solidified, the fluidity is reduced, and the ejected N 2
Since the flow rate of the gas is large, the tip of the molten glass flow 111 does not come into contact with the receiving dies 211a and 211b at all, and in addition to the use of the above-described separation method, the molten glass lump having no defect on the surface. 112 was obtained.

【００５２】次に、溶融ガラス塊１１２の粘度が１０5
ｄＰａ・ｓとなったところで、図７に示すように、受け
型ユニット２０１を開き、溶融ガラス塊１１２を成形型
ユニット２０２の成形型２２１の成形面上に載置した。
ここで、前回の実施の形態に比較して、粘度が若干高め
の所で載置しているのは、溶融ガラス塊１１２の重量が
大きくなっているためで、成形型２２１に載置した際に
溶融ガラス塊１１２の下面が変形をおし、転がり難い形
状になるのを防ぐためである。Next, the viscosity of the molten glass lump 112 becomes 10 5
When dPa · s was reached, as shown in FIG. 7, the receiving mold unit 201 was opened, and the molten glass lump 112 was placed on the molding surface of the molding die 221 of the molding die unit 202.
Here, compared with the previous embodiment, the reason why the glass is placed at a place where the viscosity is slightly higher is that the weight of the molten glass lump 112 is large, This is to prevent the lower surface of the molten glass lump 112 from being deformed and becoming a shape that is difficult to roll.

【００５３】また、成形型ユニット２０２には、予め、
超音波振動を与えておき、更に、接続パイプ２２３を経
由して、２００℃の温度のＮ2 ガスを、毎分：２０リッ
ター流しておいた。更に、溶融ガラス塊１１２の載置の
後、直ちに、成形型ユニット２０２に、矢印Ｅのよう
に、左右に振幅：５ｍｍで、周期が０．２秒の振動を与
え、溶融ガラス塊１１２を成形型２２１の成形面上で転
がしながら、約３０秒かけて、およそ３００℃になるま
で、冷却固化した。The molding die unit 202 has
Ultrasonic vibration was given, and N 2 gas at a temperature of 200 ° C. was flowed through the connecting pipe 223 at a rate of 20 liters per minute. Immediately after the placement of the molten glass block 112, the mold unit 202 is vibrated with an amplitude of 5 mm to the left and right and a cycle of 0.2 seconds as shown by an arrow E to form the molten glass block 112. While being rolled on the molding surface of the mold 221, it was cooled and solidified to about 300 ° C. in about 30 seconds.

【００５４】前の工程で得られた溶融ガラス塊１１２
は、前述の実施の形態に比較して、径が大きいため、上
部が表面張力により、多少平たくなっており、図６およ
び図７に示すように、球形の状態ではなかったが、成形
型２２１の成形面から噴出するガスの温度を上げ、溶融
ガラス塊の温度が下がり難くして置くことで、溶融ガラ
ス塊１１２が急激に固化することなく、粘性がある内に
転動させることができるため、得られたガラス素子は、
十分な真球度を有しており、その重量バラツキも±０．
３％以内に収まり、良好な結果が得られた。The molten glass lump 112 obtained in the previous step
Is larger in diameter than the above-described embodiment, so that the upper portion is slightly flat due to surface tension, and is not in a spherical state as shown in FIGS. By increasing the temperature of the gas ejected from the molding surface of, and keeping the temperature of the molten glass lump hard to lower, the molten glass lump 112 can be rolled in a viscous state without being rapidly solidified without being rapidly solidified. The obtained glass element is
It has sufficient sphericity and its weight variation is ± 0.
Within 3%, good results were obtained.

【００５５】（第４の実施の形態）次に、第３の実施の
形態と同じ型、装置、材料を用いて、目標重量：１．５
グラム、直径：９．８０ｍｍのガラス素子を成形した。
ここでは、第３の実施の形態と同様に、ノズル口１０２
からの流出量を、９グラム／分となるように、流出パイ
プ１０１、ノズル口，１０２の温度を制御し、溶融ス流
からガラスを分離して、所定重量の溶融ガラス塊を得る
までの成形タクトを約１０秒に設定した。なお、このさ
いの重量の微調整は、第３の実施の形態の場合と同じに
行った。(Fourth Embodiment) Next, using the same mold, apparatus, and material as those of the third embodiment, the target weight is 1.5.
A glass element having a gram diameter of 9.80 mm was formed.
Here, as in the third embodiment, the nozzle port 102
The temperature of the outflow pipe 101, nozzle port, and 102 is controlled so that the amount of outflow from the glass is 9 grams / minute, and the glass is separated from the molten stream to form a molten glass mass having a predetermined weight. The tact was set at about 10 seconds. The fine adjustment of the weight was performed in the same manner as in the third embodiment.

【００５６】その結果、同様に、全く欠陥がない溶融ガ
ラス塊１１２を得た後に、この溶融ガラス塊１１２の粘
度が１０6 ｄＰａ・ｓとなったところで、図７に示すよ
うに受け型ユニット２０１を開き、溶融ガラス塊１１２
を成形型ユニット２０２の成形型２２１の成形面上に載
置した。また、成形型ユニット２０２には、予め、超音
波振動を与えておき、更に、接続パイプ２２３を介し
て、３００℃の温度のＮ 2 ガスを毎分：２０リッター、
流しておいた。As a result, similarly, there was no defect in the molten gas.
After obtaining the lath lump 112, the viscosity of the molten glass lump 112
Degree 106When dPa · s is reached, it is shown in FIG.
The receiving mold unit 201 is opened as shown in FIG.
Is placed on the molding surface of the molding die 221 of the molding die unit 202.
Was placed. In addition, a supersonic
Wave vibration is given, and further, through the connection pipe 223.
And N at a temperature of 300 ° C. TwoGas per minute: 20 liters,
I was shedding.

【００５７】しかして、溶融ガラス塊１１２の載置後、
直ちに、矢印Ｆのように、成形型ユニット２０２が、半
径が５ｍｍの円を０．５秒で１回描くように、揺動さ
せ、溶融ガラス塊１１２を成形型２２１の成形面上で転
がしながら、約４０秒かけて、Ｎ２ ガスの温度とほぼ
同じ温度になるまで冷却固化した。この実施の形態で
は、第３の実施の形態と同様に、溶融ガラス塊１１２は
球形の状態ではなかったが、成形型２２１の成形面から
噴出するガスの温度を上げ、溶融ガラス塊の温度を下が
りに難くしておいたため、溶融ガラス塊１１２が、急激
に固化することなく、粘性がある内に転動されるため
に、得られたガラス素子は、十分な真球度を有してお
り、重量バラツキも±０．２５％以内に収まり、良好な
結果が得られた。After placing the molten glass block 112,
Immediately, as indicated by an arrow F, the molding die unit 202 is swung so as to draw a circle having a radius of 5 mm once in 0.5 seconds, and the molten glass lump 112 is rolled on the molding surface of the molding die 221. Approximately 40 seconds, the mixture was cooled and solidified until the temperature became almost the same as the temperature of the N2 gas. In this embodiment, as in the third embodiment, the molten glass lump 112 is not in a spherical state, but the temperature of the gas ejected from the molding surface of the molding die 221 is increased to reduce the temperature of the molten glass lump. The glass element obtained had a sufficient sphericity because the molten glass block 112 was rolled while viscous without being solidified rapidly, because it was difficult to lower. , The variation in weight was also within ± 0.25%, and good results were obtained.

【００５８】[0058]

【発明の効果】本発明は、以上説明したようになり、ガ
ラス流出パイプより流出する溶融ガラス流から一定量の
ガラスを受型に受けた後に分離し、その分離した溶融ガ
ラス塊を、前記受型から成形用の成形型に移し、該成形
型の上で球状に成形することにより、溶融ガラスから直
接に、しかも、非常に重量精度が良く、真球度の高い無
欠陥のガラス素子が連続して供給することが可能とな
り、光学素子のレンズなどのガラス製品を大量に安価に
提供することができる。According to the present invention, as described above, a certain amount of glass is separated from a molten glass stream flowing out of a glass outflow pipe after being received in a receiving mold, and the separated molten glass lump is subjected to the receiving. By transferring from the mold to the mold for molding and forming it into a sphere on the mold, the glass element directly from the molten glass, with very good weight accuracy and high sphericity, is continuous. It is possible to supply glass products such as lenses of optical elements in large quantities at low cost.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明で用いられる成形装置の概略構成図であ
る。FIG. 1 is a schematic configuration diagram of a molding apparatus used in the present invention.

【図２】同じく、本発明における溶融ガラス塊の切断方
法の過程の説明図である。FIG. 2 is an explanatory view of a process of a method for cutting a molten glass lump according to the present invention.

【図３】同じく、過程の説明図である。FIG. 3 is an explanatory view of a process.

【図４】同じく、過程の説明図である。FIG. 4 is an explanatory view of a process.

【図５】本発明の第２の実施の形態での成形型の概略構
成図である。FIG. 5 is a schematic configuration diagram of a molding die according to a second embodiment of the present invention.

【図６】本発明の第３、４の実施の形態での受型の概略
構成図である。FIG. 6 is a schematic configuration diagram of a receiving die according to third and fourth embodiments of the present invention.

【図７】同じく、成形型での成形方法の説明図である。FIG. 7 is an explanatory view of a molding method using a molding die.

【符号の説明】[Explanation of symbols]

１、２０１ 受型ユニット ２、２ａ、２０２ 成形型ユニット １１、２１１ａ、２１１ｂ 受型 ２１、２１ａ、２２１ 成形型 ３１ 発振機（超音波発振器） １０１ ガラス流出パイプ １１２ 溶融ガラス塊 １１２ａ ガラス １１３ クビレ DESCRIPTION OF SYMBOLS 1, 201 Receiving mold unit 2, 2a, 202 Molding unit 11, 211a, 211b Receiving mold 21, 21a, 221 Molding 31 Oscillator (ultrasonic oscillator) 101 Glass outflow pipe 112 Molten glass lump 112a Glass 113 Crack

───────────────────────────────────────────────────── フロントページの続き (72)発明者 久保 裕之 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 余語 瑞和 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Kubo 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Mizuka Azuma 3-30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Non Corporation

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 ガラス流出パイプより流出する溶融ガラ
ス流から一定量のガラスを受型に受けた後に分離し、そ
の分離した溶融ガラス塊を、前記受型から成形用の成形
型に移し、該成形型の上で球状に成形することを特徴と
するガラス素子の製造方法。1. A method according to claim 1, wherein a certain amount of glass is separated from a molten glass stream flowing out of a glass outflow pipe after being received in a receiving mold, and the separated molten glass lump is transferred from the receiving mold to a molding die. A method for producing a glass element, comprising forming a glass element into a spherical shape on a molding die. 【請求項２】 前記受型が多孔質の材料で作られ、その
多孔質の受面からガスを噴出することにより、溶融ガラ
スからのガラス、ないし、分離された溶融ガラス塊と前
記受面とを非接触の状態に保つことを特徴とする請求項
１に記載のガラス素子の製造方法。2. The receiving mold is made of a porous material, and a gas from a molten glass or a separated molten glass lump and the receiving surface are formed by ejecting gas from the porous receiving surface. The method for producing a glass element according to claim 1, wherein the glass element is kept in a non-contact state. 【請求項３】 前記成形型が多孔質の材料で作られ、そ
の多孔質の成形面からガスを噴出することにより、受型
から受けた溶融ガラス塊、ないし、成形したガラス素子
と前記受面とを非接触の状態に保つことを特徴とする請
求項１あるいは２に記載のガラス素子の製造方法。3. The molding die is made of a porous material, and a gas is blown out of the porous molding surface, so that a molten glass lump received from a receiving die or a molded glass element and the receiving surface are formed. 3. The method for producing a glass element according to claim 1, wherein the substrate is kept in a non-contact state. 【請求項４】 溶融ガラス流から一定量のガラスを受型
に受けた後に分離する際に、前記受型を下降させて、ガ
ラス流出パイプより流出する溶融ガラス流と受型上の前
記ガラスとの間にくびれを発生させ、次いで、前記受型
の下降速度を落とすか、または、停止させて、前記ガラ
スの自重と表面張力とで、前記くびれを成長させること
により、くびれ部分から前記溶融ガラス流とガラスとを
分離して、所要の溶融ガラス塊を得ることを特徴とする
請求項１または２に記載のガラス素子の製造方法。4. When a certain amount of glass is separated from a molten glass stream after receiving the same in a receiving mold, the receiving mold is lowered so that the molten glass flow flowing out of a glass outflow pipe and the glass on the receiving mold are separated from each other. Between the neck and the molten glass from the neck by growing the neck with the own weight and surface tension of the glass by lowering or lowering the descending speed of the receiving mold. The method for producing a glass element according to claim 1, wherein the flow and the glass are separated to obtain a required molten glass lump. 【請求項５】 受型から溶融ガラス塊を受ける成形型の
成形面は、凹状であり、前記成形面上に前記溶融ガラス
塊を移す際に、前記成形面の中心から離れた個所に前記
溶融ガラス塊を置くことにより、前記成形面上で前記溶
融ガラス塊に回転力を付与することを特徴とする請求項
１ないし４の何れかに記載のガラス素子の製造方法。5. A molding surface of a molding die which receives a molten glass lump from a receiving mold is concave, and when the molten glass lump is transferred onto the molding surface, the molten glass lump is placed at a position away from the center of the molding surface. The method for manufacturing a glass element according to any one of claims 1 to 4, wherein a rotational force is applied to the molten glass lump on the molding surface by placing the glass lump. 【請求項６】 前記成形型は、これに加えた往復動、回
転動による振動により、好ましくは、超音波による振動
により、成形面上の溶融ガラス塊を回転させることを特
徴とする請求項１ないし４の何れかに記載のガラス素子
の製造方法。6. The molding die rotates the molten glass mass on the molding surface by vibration caused by reciprocating motion and rotational motion added thereto, preferably by vibration caused by ultrasonic waves. 5. The method for producing a glass element according to any one of items 4 to 4. 【請求項７】 多孔質材料よりなる前記成形型の成形面
から噴出するガスの流量を、成形面上において不均一に
することで、溶融ガラス塊を回転させることを特徴とす
る請求項１〜４の何れかに記載のガラス素子の製造方
法。7. The molten glass block is rotated by making the flow rate of gas ejected from a molding surface of the molding die made of a porous material non-uniform on the molding surface. 5. The method for producing a glass element according to any one of 4.
JP17876398A 1998-06-25 1998-06-25 Production of glass element Pending JP2000007360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17876398A JP2000007360A (en) 1998-06-25 1998-06-25 Production of glass element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17876398A JP2000007360A (en) 1998-06-25 1998-06-25 Production of glass element

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Publication Number Publication Date
JP2000007360A true JP2000007360A (en) 2000-01-11

Family

ID=16054192

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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